package cn.tedu.online.day10;


import java.util.Iterator;

public class MyFilter {
    public static Iterator<String> iterator = new Iterator<String>() {
        @Override
        public boolean hasNext() {
            return false;
        }

        @Override
        public String next() {
            return null;
        }
    };

    public interface A{
        void t();
    }

    private class T implements A{

        @Override
        public void t() {

        }
    }

    public static void main(String[] args) {

        String a = "AAA";
        a.toLowerCase();
        System.out.println(a);
    }
}
